Sent through debit order forms but still receiving calls from Wesbank

I sent through my debit order details to Wesbank on the 20 March 2018 (2 weeks ago) but I am still receiving telephone calls to make payments

Why has Wesbank not processed my debit order forms and why are there still calling me when I gave them permission to debit my account for the 25th of every month. The form was sent to ESC Debit Order Change **********

Account: ********** 8272